Shaquille O'Neal, the man with four rings, 28,596 career points and scores of nicknames, has finally decided to call it quits, ending one of the most colorful careers in NBA history that will surely culminate with a Hall of Fame induction.O'Neal, 39, officially announced his retirement Wednesday using the new social media tool Tout, a real-time video messaging service to announce to his fans: "We did it. Nineteen years baby. I want to thank you very much, that's why I'm telling you first, I'm about to retire. Love you, talk to you soon."